package com.hmdp.utils;


import cn.hutool.core.bean.BeanUtil;
import com.hmdp.dto.UserDTO;
import com.hmdp.entity.User;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.web.servlet.HandlerInterceptor;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.util.Map;
import java.util.concurrent.TimeUnit;

/**
 * @Author Mr.Wen
 * @Version 1.0
 */
public class UserInterceptor implements HandlerInterceptor {
    private StringRedisTemplate stringRedisTemplate;

    public UserInterceptor(StringRedisTemplate template) {
        this.stringRedisTemplate = template;
    }

    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
//        获取请求头中的token
        String token = request.getHeader("authorization");
//        基于token获取user对象
        if (token == null) {
//            不存在，拦截
            response.setStatus(401);
            return false;
        }
        Map<Object, Object> userMap = stringRedisTemplate.opsForHash().entries(RedisConstants.LOGIN_USER_KEY + token);
        if (userMap.isEmpty()) {
            response.setStatus(401);
            return false;
        }
//        map转为对象
        UserDTO userDTO = BeanUtil.fillBeanWithMap(userMap, new UserDTO(), false);
//        保存用户信息到ThreadLocal
        UserHolder.saveUser(userDTO);
//         刷新token有效期
        stringRedisTemplate.expire(RedisConstants.LOGIN_USER_KEY + token, RedisConstants.LOGIN_USER_TTL, TimeUnit.MINUTES);
        return true;
    }

    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
//        移除用户
        UserHolder.removeUser();
    }
}
